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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ef9e0dac56c3af11a31a9a7eafb92106ad35ae5f2422aacd443d99bbd7fc62b7' 
  AND token = 'bonzIw/+boIq1HJ4jvWCwwTrAVnvD4XAqGLm+6ed12o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}